中国村镇生活垃圾的养分与重金属含量特征及其农用潜力分析

对全国12个省份72个典型村镇进行了生活垃圾采样调查,系统分析了我国农村生活垃圾的基本理化特性、养分含量与重金属特征及其农用潜力。研究表明:我国典型村镇生活垃圾含水率为(53.68±8.84)%,p H为7.11±0.56,有机质含量为(49.04±10.49)%,C/N约为43∶1,C/P约为144∶1。除C/N略高外,其余特性均适合进行堆肥化处置。我国典型村镇生活垃圾中重金属As、Hg、Pb、Cd、Cr,Cu和Zn含量分别为(7.645±8.729),(0.737±0.480),(21.798±17.606),(3.356±11.012),(108.632±84.011),(36.834±10.905),(80.093±42.237)mg/kg。与国内相关标准相比,只有Hg、Cd超标,最大超标率分别为29.17%、43.75%;与欧美相关标准相比,仅有Cd、Cr超标,最大超标率分别为25.69%、37.50%。

NUTRIENTS AND HEAVY METAL CONTENT CHARACTERISTICS OF RURAL LIVING SOLID WASTE IN CHINA AND AGRICULTURAL UTILIZATION FEASIBILITY

In this paper,we collected samples of typical rural living solid waste from 72 villages in 12 provinces in China,and analyzed elemental physicochemical characteristics,nutrients content and heavy metal contents of these samples.After determination and data analysis on these samples,the results indicated that the water content of typical rural living solid waste was (53.68 ± 8.84) ％,pH value was 7.11 ± 0.56,the proportion of organic matter was (49.04 ± 10.49) ％,C/N and C/P was 43∶1 and 144∶ 1,respectively.Concentration of As,Hg,Pb,Cd,Cr,Cu and Zn in these samples was (7.645 ± 8.729),(0.737 ±0.480),(21.798 ± 17.606),(3.356 ± 11.012),(108.632 ±84.011),(36.834 ± 10.905),(80.093 ± 42.237) mg/kg,respectively.Compared with relative standards,only the concentration of Hg and Cd exceeded the corresponding domestic standards by 29.17％ and 43.75％,respectively,and the concentration of Cd and Cr exceeded that of Europe by 25.69％ and 37.50％,respectively.